What does EVAL keyword do?
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                 Key: PIG-1621
                 URL: https://issues.apache.org/jira/browse/PIG-1621
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.7.0
            Reporter: Alan Gates
            Assignee: Xuefu Zhang
            Priority: Minor
             Fix For: 0.9.0


EVAL is listed as a keyword in Pig Latin, in both the documentation and the 
QueryParser.jjt file.  However, it has no productions in the grammar and no 
further mention in the documentation.  We need to either clarify what it does, 
or why we are reserving it as a keyword, or remove it.

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